CO2 laser imaging interferometer on LHD
CO2 laser imaging interferometer on LHD
复制标题
LHD 上的 CO2 激光成像干涉仪
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
S. Okajima
中科院分区：
文献类型：
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作者：
Kokichi Tanaka;L. Vyacheslavov;K. Kawahata;T. Tokuzawa;S. Okajima
设计了一台用于测量大螺旋线器件（LHD）电子密度分布和电子密度起伏的CO2激光（λ=10.6 μm）成像干涉仪。这种诊断的目的是在高密度操作中（特别是在弹丸注入放电中）可靠的电子密度监测，精确测量电子密度分布和观察密度波动。采用CO_2激光器，折射效应可以忽略不计，保证了干涉仪在高密度下不发生条纹跳变。我们计划获得5 mm的空间分辨率（两个280 mm平板光束各56 ch，一个250 mm为50 ch，80 mm交叉光束为16 ch），3×10−3 rad的相位分辨率和200 kHz的频率响应。 波动将在7×10−3 k 0.6 mm−1的波数范围内进行研究。
A CO2 laser (λ=10.6 μm) imaging interferometer is designed for electron density profile and electron density fluctuation measurements on large helical device (LHD). The purposes of this diagnostic are reliable electron density monitor in high density operation (especially in pellet injection discharge), precise measurement of electron density profiles and observations of density fluctuations. By using a CO2 laser, refraction effect becomes negligible, and the interferometer promises to be free from fringe jumps at high density. We plan to get 5 mm spatial resolution, (56 ch for each of two 280 mm slab beams, 50 ch for one 250 mm and 16 ch for 80 mm crossed beam), 3×10−3 rad phase resolution and 200 kHz frequency response for the above purpose. And fluctuation will be studied within the wave number range of 7×10−3⩽k⩽0.6 mm−1.